used to create negative pressure in a room when clearing air for asbestos removal and other harmful particulates
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Mathematically speaking, 0 is neither positive nor negative. In machine language in computers, 0 is considered as "positive" since the negative flag is not set.
I don't think velocity can be a negative number... Use positive.
because we breathe in the oxygen which is flowing around this earth and when we breathe in this oxygen around us ,we also breathe in air pollution which is not good for all things living on this planet.
is that both grasslands and clearing forests for farming are both negative and effective to the environment because the forests are what pollutes the air for us to breath with oxygen and that gives us nitrogen that we both need
Negative * positive = negative Positive * positive = positive Negative * negative = positive